meson: fix systemd service bugs

The logic for ENABLE_PHAL_TRUE was reversed under meson.

prefix was omitted when computing the path for the bindir replacement
token in the system unit files.

Fixes: 919e408aaad453f94e1ff3d35440b8fc8a2f3e13
Change-Id: I096d1f69554b23c20bd4836b36ffa5656a219333
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
1 file changed